Not to knock on anyone's hustle, but in the age of online, is any guide really worth it? The point of the FGC community is to grow together as competitive players, share their tech and let the game grow. In that respect, I think there is no reason to ever buy the guide. The forums will support you, and at the end of the day, the patches will change a lot of things entirely about how we view the game, just look at MK. So, no, if you're a serious FG player or plan to be a part of the community, I'd say it's not worth it.
On the other hand, there is an entirely different market of people out there, the one that is significantly larger than our small MK scene or even the whole FGC scene. Those are casual gamers who play for fun, against friends and don't really think of attending tournaments. Or maybe it's someone's first fighting game. In that case, a guide like that is a good and valuable resource to help those players get into the game.
I just don't get why promote this guide to us, the FGC? Promote it to the other market.